Friday, 07 December 2007 14:10

1923 Austin Seven "Boulogne" Racers

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1923 Austin Seven "Boulogne" Racers
There were three of these fabric bodied 2 seat racing cars built by the Austin works in 1923.  The first was registered OK 7095 and was driven by Captain Arthur Waite to the Brooklands Easter Small Car Handicap where he did a flying lap at over 62 mph and achieved a race average of 59.03 mph.  He then drove the car back to his home in Bromsgrove.  The next race he entered was the 250 Km Italian Grand Prix des Cyclecars at Monza on the 4th May which he won at an average speed of 57 mph and set the fastest lap at 64 mph.
The two other, similar, cars were made ready for Brooklands and ran as a team in the BARC Summer and August meetings and were by this date lapping at 75 mph.  In September the three car team was entered for the Boulogne Motor Week where they failed to gain any awards as two of them retired with engine lubrication problems and the third crashed.  Arthur Waite was driving OK 7095 as before with Alf Depper as riding mechanic.  Lou Kings and Len Brokas were in OK 8945 and Harold Cutler and R. E. O. Hall in OL 166. These cars were raced throughout 1924 virtually unchanged and Waite with Roddis competed at Le Mans where they finished  3rd and 4th in the 750 cc class for the Grand Prix des Voiturettes.                                                                                                                                  By the end of 1924 other drivers such as Gordon England were much more competitive and so these three cars were retired from active service.                                                                                                                                                                                                                                                                                              The technical specification was, and we quote from The Austin Seven Source Book by Bryan Purves:                                                                                                                                                                                       Running Gear                                                                                                                                            In the first instance the prototype was virtually as the prototype touring cars but as developments continued through the challenge of racing further minor modifications were made to the chassis and allied components. The basic production touring chassis continued to be used incorporating the radius arm ball flange that was fitted with one nut and a spring washer.  Also a specially cast steering box was introduced in order to lower the four spoke deeply dished steering wheel. Hartford shock absorbers were fitted at the front and the rear for the Boulogne event with the springs taped and corded.                                                                                                                                                                                                                                                                                                                                                 Engine                                                                                                                                                   The original prototype engine was a standard touring type bored out to 747. 5 cc producing 10.5 bhp at 2400 rpm with a working maximum of 29 bhp at 4700 rpm. The final team of three cars were fitted with twin updraught Cox-Atmos carburetors, outside exhaust systems, high and quick lift camshafts fitted into sand cast aluminium crankcases with the camshaft roller bearing outer track larger than standard in order to allow the high cam lobes to pass through it. Both the inlet and exhaust manifolds were special in order to raise the position of the exhaust pipe.  Stronger duplex valve springs featured along with a special cylinder head.  Single ring aluminium pistons were also fitted achieving a compression ratio of 6.8 : 1. The production 1 1/8 crankshaft was drilled for pressure lubrication with the oil passing from No. 1 big end to No. 2 and from 3 to 4 achieved by two semicircles of of copper pipe that were joined together by two double ended banjo fittings and fixed to the crankshaft by means of hollow bolts which screwed directly into the big end oilways. A special housing was fitted over the starting handle dog in order to feed the oil into the front of the crankshaft.  With the pressure lubricated engine it was estimated that speeds up to 5000 rpm could be maintained.  K.L.G. F. 12 mica sparking plugs were used. No electrical or mechanical starter was fitted to these cars.                                                                                                                                                                                                                                                                                                                             Electrical  No dynamo was fitted.  A scintilla magneto was used and in 1924 replaced with a BLIC.                                                                                                                                                                                        Clutch Pre-production clutch and flywheel assembly.                                                                                                                                                                                                                                                                            Gearbox Three forward and reverse crash gearbox with a lengthened gearlever protruded in a pleasant sweeping curve with the reverse gear catch remaining in an identical position to the production touring cars. Gearbox ratios: 1st. 3.25, 2nd. 1.82 and top 1 : 1 All-metal universal joints were used, the outer half of the front universal manufactured from bronze and the inner from steel.                                                                                                                                                                                        Back Axle The original prototype racer was fitted with a 4.4 : 1 back axle ratio in a standard 3’ 4” axle casing.  In 1924 the cars were fitted with a 4.5 : 1 ratio.                                                                                                                                                                                                                                                                  Wheels and Tyres Wire wheels fitted with 26 x 3 “ Beaded edge Palmer Cord tyres.                                                                                                                                                                                                                      Coachwork A light two seater doorless fabric body the shells of which were composed of an ash framework covered with a painted fabric which reduced the weight to approximately 6 cwt.  The staggered loose fitting seat cushions rested directly onto the floor with the back squabs slotting between wooden supports in order to prevent them sliding.  The mechanic rode with his hand around the back of the driver in normal fashion.  An 11 gallon fuel tank was mounted on the bulkhead with accessibility only from under the bonnet and retained in position by two leather straps, the rearmost re-positioned when bulges were added to the sides of the body. At the front of the car was the Austin Seven radiator cowl as used on the pre-production cars with the addition of a gauze stone shield.  Within the confines of the cockpit was fitted, under what would be the mechanic’s outstretched legs, a fixed subsidiary oil tank that fed the sump by means of a double-barrelled hand operated pump, the barrel of which held one sixth of a pint of oil.  Forward movement of the lever discharged one barrel into the crankcase while recharging the other.  Provision was also made for the mechanic to adjust the rear brakes whilst the car was moving.  Internally was a clipped pre-shaped predetermined height wooden block designed so that the car could be lifted  quickly onto it in the event of a punctured tyre whilst racing. A small shield was also fitted directly between the exhaust manifold and the petrol tap to assist in preventing fire in the event of an exhaust manifold gasket blowing or the petrol tank leaking.  Another shield was also fitted to the lower part of the side panel to assist in preventing stones that could be thrown-up and hit the petrol pipes at their junction with the twin Cox-Atmos carburetors. In 1924 the body of Waite’s car was “faired-in” and a celluloid screen fitted filling the space between the steering wheel and the scuttle but still allowing good instrument visibility.  During 1924 the 11 gallon fuel tank was replaced with a 9½ gallon unit.                                                                                                                                                                                                                                                                                                           Dimensions Wheelbase 6’ 3”, track 3’ 4”, gross weight 6 cwt.                                                                                                                                                                                                                                                               Body Colours Black body and wheels with a white radiator cowl.  (Arthur Waite’s racing colours since 1920).                                                                                                                                                                                                                                                                                                                                                        Trim Black leathercloth upholstery.                                                                                                                                                                                                                                                                                                      The car shown in these pictures is a faithful replica of the Cutler car OL 166 built from original parts by Barry Argent.      

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Read 12690 times Last modified on Saturday, 13 June 2020 19:26